nwbrew:
I've been kegging for awhile now with no problems. Lately though it seems that when the keg is about half full I get way too much head while pouring. I bleed the CO2 and lower the pressure but it doesn't help.

Where do I start ? Does it have anything to do with the length of the beer line ?

There is also section about balancing the system:http://www.draughtquality.org/A-Matter-of-Balancehttp://www.draughtquality.org/f/ch5.pdf

hamiltont:
I read somewhere recently that someone had the same problem. Ended up the Out poppet was full of hops. Just a thought.

bluesman:
I've had the same problem recently as well. The only thing that seems to help is to lower the pressure and bleed off the CO2 about 30% or so. So if you are maintaining your keg at 10psi...drop it down to about 7psi. You may lose some cabonation...so it's a trade off.